Jaquet-Droz, Large Seconds series, model: J013034240, Tourbillon watch, is a combination of the brand's signature design and complex craftsmanship. Made of 18K white gold, with a diameter of 43mm, it continues the brand's signature "8" shaped layout. At 12 o 'clock is the tourbillon frame, and at 6 o 'clock is the hour and minute display dial. The black dial is decorated with Geneva waves and features a sapphire double inner ring. Equipped with the self-produced 25JD automatic winding tourbillon movement, the rotor is crafted from 18K white gold and inlaid with black onyx, echoing the overall design. The tourbillon frame is made of sapphire material. When rotating, the operation of the internal escapement structure can be clearly observed. It's a single watch and a good price.